Andean Plateaus
The topography is relatively plain, composed of some stretches of mounts and mountain ranges of small altitudes that do not have to compromise the natural flow of the circulation of the winds. Moreover it is endowed with vegetal covering of average height, in view of the sped up process of urban occupation in its entorno. Therefore, the factor topography is not considered significant inside of the area with regard to the processes of atmospheric dispersion. Figure 1. River Works with wood Figure 1.1. Waterfall of the Teotnio/River Works with wood Hydrography In accordance with the Atlases of Rondnia, the hidrogrfica net of the State is represented by the River Wood and its tributaries, being composed for seven basins: of the Guapor (including the Cabixi rivers, Corumbiara, Meques, Is Miguel and Cautrio), of the Mamor (Pacas Novos and Sotrio), of the Anun, the Mutum Paran, the Jaci Paran (Formoso, Branco and San Francisco), of the Jamari (Candeias) and Machado or Ji-Paran (Juru, Machadinho, Jar, Urup, Commemoration and Baron of Melgao). The River Wood (1,700 km of extension), crosses the State the northwest and is formed by three important rivers: Guapor, Mamor and Beni. The River Guapor has its springs located in the southern abutments of Serra or Chapada of the Parecis and constitutes the natural limit with Bolivia.
It enters the cities of Marques Coast and Guajar Mirim receives the River Mamor, that is born in Andean Plateaus, starting to incorporate the name of the tributary In the neighborhoods of New Mamor, receives the River, also originary of Andean Plateaus. In the height of the city of Abun receives the contributions from the River Homonym and starts to call River Wood. In accordance with its course the River Wood can be divided in two stretches: Low Wood: identified for its formadores (Mamor and Beni), it is not navigable because of the unevenness.
